Effectiveness of enhanced mineral weathering as a carbon sequestration tool and alternative to agricultural lime: An incubation experiment

Dietzen, Christiana; Harrison, Robert; Michelsen-Correa, Stephani

doi:10.1016/j.ijggc.2018.05.007

Cited by 65 publications

(41 citation statements)

References 36 publications

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“…However, the agricultural soil in the columns was low in organic matter (~1%), in common with most agricultural soils, and the control and treated soil organic carbon concentrations matched each other after 120 days (Figure 6c). Soil respiration measurements following low (10 t/ha) and high (50 t/ha) applications of finely powdered olivine to an acidic organic‐rich podzol soil (pH = 4.9) support this view, with no significant increases in cumulative CO 2 fluxes relative to unamended controls (Dietzen et al, 2018).…”

Section: Resultsmentioning

confidence: 96%

“…Experimental and field trial programmes are thus underway examining CO 2 removal rates and feedbacks on crop performance and soil health. Such trials have reported rates of CO 2 removal following amendment of different agricultural soils across a range of application rates with the fast‐weathering magnesium silicate, olivine (Amann et al, 2018; Dietzen, Harrison, & Michelsen‐Correa, 2018; Renforth, Pogge von Strandmann, & Henderson, 2015; ten Berge et al, 2012). However, CO 2 removal by weathering of olivine‐dominant dunite is often accompanied by increases in potentially toxic nickel (Ni) and chromium (Cr) concentrations that may be problematic for agricultural applications.…”

Section: Introductionmentioning

confidence: 99%

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Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

Kelland

Wade

Lewis

et al. 2020

Global Change Biology

149

124

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Land-based enhanced rock weathering (ERW) is a biogeochemical carbon dioxide removal (CDR) strategy aiming to accelerate natural geological processes of carbon sequestration through application of crushed silicate rocks, such as basalt, to croplands and forested landscapes. However, the efficacy of the approach when undertaken with basalt, and its potential co-benefits for agriculture, require experimental and field evaluation. Here we report that amending a UK clay-loam agricultural soil with a high loading (10 kg/m 2 ) of relatively coarse-grained crushed basalt significantly increased the yield (21 ± 9.4%, SE) of the important C 4 cereal Sorghum bicolor under controlled environmental conditions, without accumulation of potentially toxic trace elements in the seeds. Yield increases resulted from the basalt treatment after 120 days without P-and K-fertilizer addition. Shoot silicon concentrations also increased significantly (26 ± 5.4%, SE), with potential benefits for crop resistance to biotic and abiotic stress.Elemental budgets indicate substantial release of base cations important for inorganic carbon removal and their accumulation mainly in the soil exchangeable pools.Geochemical reactive transport modelling, constrained by elemental budgets, indicated CO 2 sequestration rates of 2-4 t CO 2 /ha, 1-5 years after a single application of basaltic rock dust, including via newly formed soil carbonate minerals whose longterm fate requires assessment through field trials. This represents an approximately fourfold increase in carbon capture compared to control plant-soil systems without basalt. Our results build support for ERW deployment as a CDR technique compatible with spreading basalt powder on acidic loamy soils common across millions of hectares of western European and North American agriculture. K E Y W O R D Scarbon removal, crop productivity, mineral weathering, negative emissions technology, reactive transport modelling, silicon, soil acidification KELLAND Et AL. | 3659

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

Kelland

Wade

Lewis

et al. 2020

Global Change Biology

149

124

View full text Add to dashboard Cite

show abstract

“…Second, neither EW nor OAE would require their own land, nutrients, or freshwater (Smith et al, 2016; although dust avoidance during EW may need freshwater, Taylor et al, 2016). They could be applied on open ocean regions or combined with agriculture with the additional benefit of enhancing crop yields and preventing soil erosion (Köhler et al, 2010;Beerling et al, 2018;Dietzen et al, 2018). Thus, in contrast to many other NETs, they are generally not competing with other Sustainable Development Goals like global food and water security but are potentially even beneficial for them (Beerling, 2017;Edwards et al, 2017;Heck et al, 2018).…”

Section: Could Enhanced Weathering (Ew) and Ocean Alkalinity Enhancemmentioning

confidence: 99%

CO2 Removal With Enhanced Weathering and Ocean Alkalinity Enhancement: Potential Risks and Co-benefits for Marine Pelagic Ecosystems

Bach¹,

Gill²,

Rickaby³

et al. 2019

Front. Clim.

170

126

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“…Besides that, the long AR time span can undermine the effectiveness of DAP to supply P to forests due to the high soil acidification potential of DAP. Therefore, rock powder application can be an alternative as nutrients are slowly released and an increase in alkalinity fluxes is expected (Dietzen et al, 2018), which can raise and stabilize the pH of soils.…”

Section: Enhanced Weathering Coupled To Afforestation and Reforestationmentioning

confidence: 99%

Impacts of enhanced weathering on biomass production for negative emission technologies and soil hydrology

et al. 2020

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Abstract. Limiting global mean temperature changes to well below 2 ∘C likely requires a rapid and large-scale deployment of negative emission technologies (NETs). Assessments so far have shown a high potential of biomass-based terrestrial NETs, but only a few assessments have included effects of the commonly found nutrient-deficient soils on biomass production. Here, we investigate the deployment of enhanced weathering (EW) to supply nutrients to areas of afforestation–reforestation and naturally growing forests (AR) and bioenergy grasses (BG) that are deficient in phosphorus (P), besides the impacts on soil hydrology. Using stoichiometric ratios and biomass estimates from two established vegetation models, we calculated the nutrient demand of AR and BG. Insufficient geogenic P supply limits C storage in biomass. For a mean P demand by AR and a low-geogenic-P-supply scenario, AR would sequester 119 Gt C in biomass; for a high-geogenic-P-supply and low-AR-P-demand scenario, 187 Gt C would be sequestered in biomass; and for a low geogenic P supply and high AR P demand, only 92 Gt C would be accumulated by biomass. An average amount of ∼150 Gt basalt powder applied for EW would be needed to close global P gaps and completely sequester projected amounts of 190 Gt C during the years 2006–2099 for the mean AR P demand scenario (2–362 Gt basalt powder for the low-AR-P-demand and for the high-AR-P-demand scenarios would be necessary, respectively). The average potential of carbon sequestration by EW until 2099 is ∼12 Gt C (∼0.2–∼27 Gt C) for the specified scenarios (excluding additional carbon sequestration via alkalinity production). For BG, 8 kg basalt m−2 a−1 might, on average, replenish the exported potassium (K) and P by harvest. Using pedotransfer functions, we show that the impacts of basalt powder application on soil hydraulic conductivity and plant-available water, to close predicted P gaps, would depend on basalt and soil texture, but in general the impacts are marginal. We show that EW could potentially close the projected P gaps of an AR scenario and nutrients exported by BG harvest, which would decrease or replace the use of industrial fertilizers. Besides that, EW ameliorates the soil's capacity to retain nutrients and soil pH and replenish soil nutrient pools. Lastly, EW application could improve plant-available-water capacity depending on deployed amounts of rock powder – adding a new dimension to the coupling of land-based biomass NETs with EW.

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Effectiveness of enhanced mineral weathering as a carbon sequestration tool and alternative to agricultural lime: An incubation experiment

Cited by 65 publications

References 36 publications

Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

CO2 Removal With Enhanced Weathering and Ocean Alkalinity Enhancement: Potential Risks and Co-benefits for Marine Pelagic Ecosystems

Impacts of enhanced weathering on biomass production for negative emission technologies and soil hydrology

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Effectiveness of enhanced mineral weathering as a carbon sequestration tool and alternative to agricultural lime: An incubation experiment

Cited by 65 publications

References 36 publications

Increased yield and CO2 sequestration potential with the C4 cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

Increased yield and CO2 sequestration potential with the C4 cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

CO2 Removal With Enhanced Weathering and Ocean Alkalinity Enhancement: Potential Risks and Co-benefits for Marine Pelagic Ecosystems

Impacts of enhanced weathering on biomass production for negative emission technologies and soil hydrology

Contact Info

Product

Resources

About

Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil

Increased yield and CO₂ sequestration potential with the C₄ cereal Sorghum bicolor cultivated in basaltic rock dust‐amended agricultural soil